Bases[]
You could have a normal wooden base, or a hardcore metal base. Well, I'm going to explain how to improve your base!
Wooden Bases[]
Wooden bases aren't the best in the game, so maybe you could either waste your time destroying it and rebuilding it, or you could save time by adding another layer to your wooden base.
Adding More Layers[]
Before you start adding more layers, you should use a little bit of your skill points and unlock stone walls (If you haven't already) and just surround your base with those little stone walls (Be sure not to block your doors). Before you do that, kill all the ghouls in the area (I'd reccommend you make 3-6 Wooden Spears), then start with the addition.
Destroying and Rebuilding[]
Nobody would do this strategy, since ghouls could kill you, savages would come and kill you, or you'd die of hunger, cold, or radiation. If you do this, do it fast.
Stone Bases[]
For stone bases, you'd think you're totally fine, but you're not. People have hammers. So add wood walls for extra protection.
Metal Bases[]
You should be fine with metal walls. You can add wood or stone wall layers for extra protection. (Optional) But when ghouls come, you should have repair hammer, nail gun, or lapabots, because there is a danger of Armored Ghoul, so repair your base all the time.